apa102-frame.js

var bl = require('bl')
var controlFrame = new Buffer([0x00, 0x00, 0x00, 0x00])

module.exports = function (pixels, cb) {
  var frame = bl()

  // start frame
  frame.append(controlFrame)

  // body frames
  var length = pixels.shape[0]
  for (var i = 0; i < length; i++) {
    frame.append(new Buffer([0xff,
      pixels.get(i, 2), // blue
      pixels.get(i, 1), // green
      pixels.get(i, 0)  // red
    ]))
  }

  // end frames
  for (i = 0; i < length / 2; i++) {
    frame.append(controlFrame)
  }

  return frame
}